According to the monitoring data of SO2 from 1996 to 2005,the time characteristics and causes of SO2 pollution were analyzed,and the changing trends of the concentration of SO2 in ten years were described by using Spearman rank related coefficient rs.

• 以1996~2005年太原市大气中SO2的监测数据为依据,分析了十年间SO2浓度的时间变化特征及原因,并采用Spearman秩相关系数法对SO2浓度变化进行了趋势分析。